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Stress-induced martensitic transformations and shape memory at nanometer scales

Publication ,  Journal Article
Frick, CP; Lang, TW; Spark, K; Gall, K
Published in: Acta Materialia
May 1, 2006

Nickel-titanium (NiTi) shape memory alloys undergo relatively large recoverable inelastic deformations via a stress-induced martensitic phase transformation. Although stress-induced phase transformations in shape memory alloys are well characterized and utilized at micrometer to meter length scales, significant opportunity exists to understand and exploit martensitic transformations at nanometer scales. Displacive stress-induced martensitic phase transformations may constitute an ideal nanometer-scale actuator, as evident in certain biological systems, such as the T4 bacteriophage. The present work uses nanoindentation to study the fundamentals of stress-induced martensitic phase transformations in NiTi shape memory alloys. The experimental results presented are the first to show evidence of discrete forward and reverse stress-induced thermoelastic martensitic transformations in nanometer-scaled volumes of material. Shape recovery due to indentation, followed by subsequent heating, is demonstrated for indent depths in the sub-10 nm range. The indentation results reveal that stress-induced martensitic phase transformations nucleate at relatively low stresses at nanometer scales, suggesting a fundamental departure from traditional size scale effects observed in metals deforming by dislocation plasticity. It is also shown that the local material structure can be utilized to modify transformation behavior at nanometer scales, yielding an insight into the nature of stress-induced martensitic phase transformations at small scales and providing an opportunity for the design of nanometer-sized NiTi actuators. © 2006 Acta Materialia Inc.

Duke Scholars

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

May 1, 2006

Volume

54

Issue

8

Start / End Page

2223 / 2234

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

APA
Chicago
ICMJE
MLA
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Frick, C. P., Lang, T. W., Spark, K., & Gall, K. (2006). Stress-induced martensitic transformations and shape memory at nanometer scales. Acta Materialia, 54(8), 2223–2234. https://doi.org/10.1016/j.actamat.2006.01.030
Frick, C. P., T. W. Lang, K. Spark, and K. Gall. “Stress-induced martensitic transformations and shape memory at nanometer scales.” Acta Materialia 54, no. 8 (May 1, 2006): 2223–34. https://doi.org/10.1016/j.actamat.2006.01.030.
Frick CP, Lang TW, Spark K, Gall K. Stress-induced martensitic transformations and shape memory at nanometer scales. Acta Materialia. 2006 May 1;54(8):2223–34.
Frick, C. P., et al. “Stress-induced martensitic transformations and shape memory at nanometer scales.” Acta Materialia, vol. 54, no. 8, May 2006, pp. 2223–34. Scopus, doi:10.1016/j.actamat.2006.01.030.
Frick CP, Lang TW, Spark K, Gall K. Stress-induced martensitic transformations and shape memory at nanometer scales. Acta Materialia. 2006 May 1;54(8):2223–2234.
Journal cover image

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

May 1, 2006

Volume

54

Issue

8

Start / End Page

2223 / 2234

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics